hello

I am using Odoo 17 online 

I have added a field in the sales for the Product Category and it work fine now i want to chose only from the product that is in that picked category

the product category field name : x_studio_product_category

I have tried to put in the product Domain this rule 

('categ_id','=',parent.x_studio_product_category)

And tried : ('categ_id','=',parent.selected_x_studio_product_category) 

but nothing happen, I can see all the products